Method and System for Transmission of Information

Abstract

The present invention relates to a method for serial transmission of information between at least one transmitter ( 7, 9, 14, 15 ) and at least one receiver ( 7, 9, 14, 15 ), with the said information being transferred by means of voltage pulses ( 13 ). The invention comprises the following steps: making an association between the information that is to be transferred and the time (T) between two predetermined edge levels (U 1 , U 2 ) of a voltage pulse; generation of a voltage pulse in the transmitter with a time difference between the flank levels (U 1 , U 2 ) corresponding: to the information that is to be transferred; and transmission of the voltage pulse from the said transmitter to the said receiver. The invention also relates to a system for such transmission of information.

1 . Method for the serial transmission of information between at least one transmitter ( 7 ,  9 ,  14 ,  15 ) and at least one receiver ( 7 ,  9 ,  14 ,  15 ), with the said information being transferred by means of voltage pulses ( 13 ), characterized in that it comprises the steps: 
 making an association between the information that is to be transferred and the time (T) between two predetermined edge levels (U 1 , U 2 ) of a voltage pulse;    generation of a voltage pulse in the transmitter with a time difference between the flank levels (U 1 , U 2 ) corresponding to the information that is to be transferred; and    transmission of the voltage pulse from the said transmitter to the said receiver.    
   
   
       2 . Method according to  claim 1 , characterized in that the time (T) between two predetermined flank levels (U 1 , U 2 ) of a voltage pulse ( 23 ) is variable.  
   
   
       3 . Method according to  claim 1  or  2 , characterized in that the time (T) between the two predetermined flank levels (U 1 , U 2 ) of the voltage pulse ( 23 ) varies in predetermined steps (T p ).  
   
   
       4 . Method according to any one of the preceding claims, characterized in that it comprises transmission of information to two or more receivers with one receiver being addressed at a time.  
   
   
       5 . Method according to  claim 4 , characterized in that the communication between transmitter ( 7 ,  9 ,  14 ,  15 ) and receiver ( 7 ,  9 ,  14 ,  15 ) comprises changing the address of the receiver ( 7 ,  9 ,  14 ,  15 ).  
   
   
       6 . Method according to any one of the preceding claims, characterized in that it is arranged to control an electric motor ( 18 ).  
   
   
       7 . Method according to  claim 6 , characterized in that it is utilized to control an electric motor ( 18 ) which consists of a fan motor arranged for ventilation of vehicle seats ( 1 ).  
   
   
       8 . System comprising a control unit ( 9 ) and at least one fan unit ( 7 ,  14 ,  15 ), which fan unit ( 7 ,  14 ,  15 ) is arranged for ventilation of vehicle seats, in which the control unit ( 9 ) and the fan unit ( 7 ,  14 ,  15 ) are arranged to communicate with each other by means of voltage pulses ( 23 ) via a serial communication bus ( 10 ), characterized in that the time (T) between two predetermined flank levels (U 1 , U 2 ) of a voltage pulse ( 23 ) is variable.  
   
   
       9 . System according to  claim 8 , characterized in that the time (T) between the two predetermined flank levels (U 1 , U 2 ) of the voltage pulse ( 23 ) is the information carrier of the communication protocol.  
   
   
       10 . System according to  claim 8  or  9 , characterized in that the time (T) between the two predetermined flank levels (U 1 , U 2 ) of the voltage pulse ( 23 ) varies in predetermined steps (T p ).  
   
   
       11 . System according to any one of claims  8 - 10 , characterized in that when there are several receivers, one receiver can be addressed at a time.  
   
   
       12 . System according to  claim 11 , characterized in that the communication between transmitter ( 7 ,  9 ,  14 ,  15 ) and receiver ( 7 ,  9 ,  14 ,  15 ) comprises changing the address of the receiver ( 7 ,  9 ,  14 ,  15 )